Hi. I'm going to try to milk both the T'Rangand Umpani for experience. I've been told that if I'm careful I can do all short of destroying the mothership. I want to do the peace mission of joining the T'Rang and Umpnai. Anyway, if I get the Chaos Malori for Z'Ant with his letter, will I still be able to do the same for the Umpani? Thanks.

Spolier Alert
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You need to give the Mook the Umpani Alliance letter. This is the only way to align the Mook with the Umpani. Z'ant only cares about seeing the Chaos Molari which you can acquire with either letter.

SPOILER ALERT
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Actually, you can give BOTH letters to the Mook so it doesn't really matter. If you get/use the T'Rang letter first, that's fine. When you go back, give the Mook the Umpani letter to get their response to complete the Umpani quest. Just make sure you join the T'Rang first or Z'ant gets PO'd at you relatively early on and you'll lose out on some of those other quests.

I presume I shouldn't take the Chaos Molori? 'cos when I do the Mook immediately get pissed off.

S-P-O-I-L-E-R A-L-E-R-T "bling" "bling"
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Switch it (the chaos calamari) with the fake Astral Dominae found in the swamp where Mr High And Mighty (TM) drops it.